Omit tls_fingerprints from server keys when empty (#223)
Omit tls_fingerprints from server keys when empty (#223)

Construct breaks if it's null instead of an array. It's a legacy field
which shouldn't be used anyway, so it could be removed altogether, but
this is just a quick fix that shouldn't affect anything else.

Signed-off-by: Tulir Asokan <d52a095ed9643bd427acb6654f10f4a52fda6a79@maunium.net>
matrix-org/gomatrixserverlib,matrix-org/gomatrixserverlib